The Most Adorable Pictures of Zac Efron and His Littlest Siblings, Olivia and Henry

In addition to his brother Dylan, who is just four years younger than the 'High School Musical' star, Zac Efron has an adorable little brother and sister

While he solidified his heartthrob status years ago, to three younger Efrons, Zac is just big brother!

In addition to his brother Dylan, who is just four years younger than the High School Musical star, Zac is also big bro to two half siblings whom his father, David, welcomed in his second marriage.

On various occasions, the older Efron brothers have shared a glimpse at adorable Olivia and Henry on their social media accounts, with Dylan once posting a sweet video montage of their sister talking about how much he loves him.

“Sorry Zac, I’m winning ❤️," he captioned the video.

From birthday wishes to family outings, see some of the most adorable moments Zac has shared with his two youngest siblings, Olivia and Henry.

Birthday Kisses

In celebration of his little sister's birthday, the proud big brother shared a set of photos to Instagram along with the caption "Happy bday lil sis 👸." In the first photo Olivia is seen looking up at her big brother wearing an adorable flower crown while in the second one, Zac leans down to give her a kiss on the head as he wraps his arms around her.

More Siblings, More Fun!

And in keeping with sweet birthday tributes, when it was time to celebrate Zac's 36th birthday, Dylan shared a carousel of images to Instagram including this one of the two holding the little ones upside down.

"I know exactly the type of big brother I want to be for Olivia and Henry because you were that brother to me," Dylan wrote in part.

Flower Power

Zac first showcased his little sister back in 2021, with a photo of him holding the pint-sized cutie in his lap along with the caption, "My sister Olivia, little heartbreaker."

Sister Storytime

And when Valentine's Day came around, Zac shared a heartfelt post on Instagram calling Olivia his "Valentine." In the photo, the shirtless actor is seen reading a book as he sits next to his little sis, who is clutching a stuffed animal.

Fun and Games

Three of the four Efron siblings were captured in this adorable shot during a family outing to the circus over the summer. In another post to his Instagram Story, Zac showed that their dad, David, had joined them.

Family Time

We know this isn't technically a photo, but it was too adorable to pass up! As the 2023 holiday season kicked off, Dylan shared how he and his family spent their Thanksgiving.

In a video posted to TikTok, Dylan and Zac are seen spinning their little siblings around in circles by their hands. After they are both placed on the ground, the little ones seem to be adorably dizzy as they wobble a bit in their festive attire.

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